ALNYLAM PHARMACEUTICALS INC

Ticker: ALNY CUSIP: 02043Q107 Class: EQTY

WESTFIELD CAPITAL MANAGEMENT CO LP's Holding History (CIK: 0001177719)

Note: Option positions (PUT/CALL) are excluded.

Q4 2025
Shares 93,444 Value ($000) $37,158 Avg Close $442.56 Range $387.03 - $495.55
Q3 2025
Shares 87,908 Value ($000) $40,086 Avg Close $407.20 Range $309.57 - $484.21
Q2 2025
Shares 186,905 Value ($000) $60,948 Avg Close $276.71 Range $205.87 - $327.21
Q1 2025
Shares 192,172 Value ($000) $51,890 Avg Close $257.00 Range $230.79 - $300.90
Q4 2024
Shares 216,126 Value ($000) $50,857 Avg Close $262.99 Range $229.86 - $304.39
Q1 2020
Shares 138,664 Value ($000) $15,094 Avg Close $115.43 Range $84.97 - $134.51
Q4 2019
Shares 249,009 Value ($000) $28,678 Avg Close $99.70 Range $73.32 - $125.72
Q3 2019
Shares 280,297 Value ($000) $22,541 Avg Close $79.11 Range $69.11 - $88.00
Q2 2019
Shares 436,033 Value ($000) $31,639 Avg Close $76.72 Range $65.81 - $96.08
Q1 2019
Shares 319,923 Value ($000) $29,897 Avg Close $83.64 Range $70.29 - $93.95
Q4 2018
Shares 270,443 Value ($000) $19,718 Avg Close $76.92 Range $60.27 - $90.00
Q3 2018
Shares 170,855 Value ($000) $14,953 Avg Close $100.59 Range $86.95 - $124.22
Q2 2018
Shares 228,140 Value ($000) $22,470 Avg Close $99.19 Range $87.35 - $118.71
Q3 2016
Shares 271,302 Value ($000) $18,389 Avg Close $70.55 Range $53.56 - $80.11
Q2 2016
Shares 276,767 Value ($000) $15,358 Avg Close $63.00 Range $49.96 - $75.08